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Creasing in evaporation-driven cavity collapse.

Matt P Milner1, Lihua Jin2, Shelby B Hutchens1

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Summary
This summary is machine-generated.

Strain-stiffening in elastomers governs crease formation in contracting cavities. The Gent constitutive relation accurately predicts crease onset and density, differing from Neo-Hookean solids.

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Area of Science:

  • Materials Science
  • Solid Mechanics
  • Polymer Physics

Background:

  • Crease formation in elastomers is a complex phenomenon.
  • Understanding crease morphology is crucial for designing soft materials.
  • Elastomeric solids exhibit unique mechanical behaviors like strain-stiffening.

Purpose of the Study:

  • To investigate crease morphology and evolution on the surface of contracting cavities in elastomers.
  • To validate theoretical predictions regarding strain-stiffening effects on crease formation.
  • To compare crease behavior in different elastomeric compositions and constitutive models.

Main Methods:

  • Controlled contraction of embedded liquid droplets within elastomeric solids via evaporation.
  • Systematic variation of elastomeric composition (Sylgard 184 mixing ratios).
  • Application of the Gent constitutive relation and Neo-Hookean models for analysis.
  • Finite element simulation of cylindrical crease geometry for energy minimization.

Main Results:

  • Strain-stiffening, modeled by the Gent constitutive relation, governs crease onset and density.
  • Crease onset predictions match experimental data using measured parameters.
  • Neo-Hookean solids form numerous short creases, while Gent solids form fewer, longer creases.
  • Experimental observations align with energy minimization principles.

Conclusions:

  • The Gent constitutive relation accurately describes crease formation in contracting elastomeric cavities.
  • Elastomer composition significantly influences crease morphology and evolution.
  • Energy minimization principles explain the observed differences in creasing behavior between Neo-Hookean and Gent solids.